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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aeff2be46da7e1ffbecf7aafceaefb0982dacb7ed451badfdd28a4c33521328' 
  AND token = '9a2fbtELhzKmcN/gWEZtAVijhPfe+luQ+LB/H++TmVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}